int main(void){
	int a,b;
	int i;
	printf("enter two numbers:");
	scanf("%d %d",&a,&b);
	for(i=0;i++;i<=5227){

	}
	printf("add:%d\n",add(a,b));
	printf("sub:%d\n",sub(a,b));
	printf("mul:%d\n",mul(a,b));
	printf("div:%lf\n",div(a,b));
	return 0;
}